[Autofill] Remove direct use of base::Time::Now() in Autofill

components/autofill/core/common/autofill_clock.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CLOCK_H_
+#define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CLOCK_H_
+
+#include <memory>
+
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+
+namespace base {
+class Clock;
+class Time;
+}  // namespace base
+
+namespace autofill {
+
+// Handles getting the current time for the Autofill feature. Can be injected
+// with a customizable clock to facilitate testing.
+class AutofillClock {
+ public:
+  // Returns the current time based on |clock_|.
+  static base::Time Now();
+
+ private:
+  friend class TestAutofillClock;
+  friend struct base::DefaultLazyInstanceTraits<AutofillClock>;
+
+  // Resets a normal clock.
+  static void SetClock();
+
+  // Sets the clock to be used for tests.
+  static void SetTestClock(std::unique_ptr<base::Clock> clock);
+
+  AutofillClock();
+  ~AutofillClock();
+
+  // The clock used to return the current time.
+  std::unique_ptr<base::Clock> clock_;
+
+  DISALLOW_COPY_AND_ASSIGN(AutofillClock);
+};
+
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_CLOCK_H_